Startup Script for devmode incl. templating

[ThomasObenaus]

Descriton

This MR adds a script for starting up the devmode locally.

• The parameters like {{host_ip_address}} and {{datacenter}} are adjusted automatically based on the script parameters.
• Those parameters are adjusted in the nomad.hcl, consul.hcl and in creg.nomad and fabio_docker.nomad.
• The job fabio_docker.nomad was added as well to have a complete, minimal dev setup.
• The original files in the repository are untouched when launching the script (since they are copied to a temp dir).

Hint

• The MR was NOT pulled from master, but from f/devmode_advanced_enhanced (was easier for now).